Springback un stamping part III: Prediction, control using variable blank holder force

摘要

Two methods to compensate for springback in stamping are modification of die geometry through trial and error and prediction through calculations or computer simulations. The first method, modifying tool geometry so that the part conforms to the desired shape after springback, requires iterative refinements during tryouts to meet part tolerances, and trial and error-based compensation is costly and time-consuming. To save time and money, stampers can minimize springback by using calculations to make minor die modifications. Springback reduction often can be achieved by controlling and modifying blank holder force (BHF).